验证码效果如下：有静态的，动态的，中空的
结合网上的图形验证码技术，不依赖第三方包纯java加工了一个比较复杂的图形验证码方案，防OCR防机器人
网上的图形验证码方案都是零星的，弄了一个随机字体、随机彩色字符、随机字体大小、随机扭曲、随机旋转等技术，能有效的防OCR、描边、深浅色等技术识别
本意是想区分登录、领券、抽奖等一些场景操作的，后来一想，随机拼人品吧，于是就有了下面的工具类
package com.test;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontFormatException;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
import javax.imageio.ImageIO;
import org.apache.log4j.Logger;
/**
* 验证码工具类：
* 随机字体、字体样式、字体大小（验证码图片宽度 - 8 ~ 验证码图片宽度 + 10）
* 彩色字符 每个字符的颜色随机，一定会不相同
* 随机字符 阿拉伯数字 + 小写字母 + 大写字母
* 3D中空自定义字体，需要单独使用，只有阿拉伯数字和大写字母
*
* @author cgtu
* @date 2017年5月9日 下午7:27:55
*/
public class RandomVerifyImgCodeUtil
{
private static Logger logger = Logger.getLogger(RandomVerifyImgCodeUtil.class);
/**
* 随机类
*/
private static Random random = new Random();
// 放到session中的key
public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";
// 验证码来源范围，去掉了0,1,I,O,l,o几个容易混淆的字符
public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz";
private static ImgFontByte imgFontByte = new ImgFontByte();
private static Font baseFont;
static
{
try
{
baseFont = Font.createFont(Font.TRUETYPE_FONT, new ByteArrayInputStream(imgFontByte.hex2byte(imgFontByte.getFontByteStr())));
}
catch (FontFormatException e)
{
logger.error("new img font font format failed. e: " + e.getMessage(), e);
}
catch (IOException e)
{
logger.error("new img font io failed. e: " + e.getMessage(), e);
}
}
// 字体类型
private static String[] fontName =
{
"Algerian", "Arial", "Arial Black", "Agency FB", "Calibri", "Cambria", "Gadugi", "Georgia", "Consolas", "Comic Sans MS", "Courier New",
"Gill sans", "Time News Roman", "Tahoma", "Quantzite", "Verdana"
};
// 字体样式
private static int[] fontStyle =
{
Font.BOLD, Font.ITALIC, Font.ROMAN_BASELINE, Font.PLAIN, Font.BOLD + Font.ITALIC
};
// 颜色
private static Color[] colorRange =
{
Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.YELLOW, Color.GREEN, Color.BLUE,
Color.DARK_GRAY, Color.BLACK, Color.RED
};
/**
* 使用系统默认字符源生成验证码
*
* @param verifySize
* 验证码长度
* @param uuid
* App端传的参数，app没有session和cookie，必须用设备号在redis记录图形验证码的值
* @param platFormName
* 平台名称：pc\wap\app app比较特殊，需要单独处理
* @param request
* 请求
* @return
*/
public static String generateVerifyCode(int verifySize)
{
return generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成验证码
*
* @param verifySize
* 验证码长度
* @param sources
* 验证码字符源
* @return
*/
private static String generateVerifyCode(int verifySize, String sources)
{
if (sources == null || sources.length() == 0)
{
sources = VERIFY_CODES;
}
int codesLen = sources.length();
Random rand = new Random(System.currentTimeMillis());
StringBuilder verifyCode = new StringBuilder(verifySize);
for (int i = 0; i < verifySize; i++)
{
verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
}
return verifyCode.toString();
}
/**
* 输出指定验证码图片流
*
* @param w
* 验证码图片的宽
* @param h
* 验证码图片的高
* @param os
* 流
* @param code
* 验证码
* @param type
* 场景类型，login：登录，
* coupons：领券 登录清晰化，领券模糊化
* 3D: 3D中空自定义字体
* GIF：普通动态GIF
* GIF3D：3D动态GIF
* mix2: 普通字体和3D字体混合
* mixGIF: 混合动态GIF
* @throws IOException
*/
public static void outputImage(int w, int h, OutputStream os, String code, String type) throws IOException
{
int verifySize = code.length();
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand = new Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Color[] colors = new Color[5];
Color[] colorSpaces = colorRange;
float[] fractions = new float[colors.length];
for (int i = 0; i < colors.length; i++)
{
colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
fractions[i] = rand.nextFloat();
}
Arrays.sort(fractions);
g2.setColor(Color.GRAY);// 设置边框色
g2.fillRect(0, 0, w, h);
Color c = getRandColor(200, 250);
g2.setColor(c);// 设置背景色
g2.fillRect(0, 2, w, h - 4);
char[] charts = code.toCharArray();
for (int i = 0; i < charts.length; i++)
{
g2.setColor(c);// 设置背景色
g2.setFont(getRandomFont(h, type));
g2.fillRect(0, 2, w, h - 4);
}
// 1.绘制干扰线
Random random = new Random();
g2.setColor(getRandColor(160, 200));// 设置线条的颜色
int lineNumbers = 20;
if (type.equals("login") || type.contains("mix") || type.contains("3D"))
{
lineNumbers = 20;
}
else if (type.equals("coupons"))
{
lineNumbers = getRandomDrawLine();
}
else
{
lineNumbers = getRandomDrawLine();
}
for (int i = 0; i < lineNumbers; i++)
{
int x = random.nextInt(w - 1);
int y = random.nextInt(h - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
g2.drawLine(x, y, x + xl + 40, y + yl + 20);
}
// 2.添加噪点
float yawpRate = 0.05f;
if (type.equals("login") || type.contains("mix") || type.contains("3D"))
{
yawpRate = 0.05f; // 噪声率
}
else if (type.equals("coupons"))
{
yawpRate = getRandomDrawPoint(); // 噪声率
}
else
{
yawpRate = getRandomDrawPoint(); // 噪声率
}
int area = (int) (yawpRate * w * h);
for (int i = 0; i < area; i++)
{
int x = random.nextInt(w);
int y = random.nextInt(h);
int rgb = getRandomIntColor();
image.setRGB(x, y, rgb);
}
// 3.使图片扭曲
shear(g2, w, h, c);
char[] chars = code.toCharArray();
Double rd = rand.nextDouble();
Boolean rb = rand.nextBoolean();
if (type.equals("login"))
{
for (int i = 0; i < verifySize; i++)
{
g2.setColor(getRandColor(100, 160));
g2.setFont(getRandomFont(h, type));
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * rd * (rb ? 1 : -1), (w / verifySize) * i + (h - 4) / 2, h / 2);
g2.setTransform(affine);
g2.drawOval(random.nextInt(w), random.nextInt(h), 5 + random.nextInt(10), 5 + random.nextInt(10));
g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + (h - 4) / 2 - 10);
}
g2.dispose();
ImageIO.write(image, "jpg", os);
}
else if (type.contains("GIF") || type.contains("mixGIF"))
{
GifEncoder gifEncoder = new GifEncoder(); // gif编码类，这个利用了洋人写的编码类
// 生成字符
gifEncoder.start(os);
gifEncoder.setQuality(180);
gifEncoder.setDelay(150);
gifEncoder.setRepeat(0);
AlphaComposite ac3;
for (int i = 0; i < verifySize; i++)
{
g2.setColor(getRandColor(100, 160));
g2.setFont(getRandomFont(h, type));
for (int j = 0; j < verifySize; j++)
{
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * rd * (rb ? 1 : -1), (w / verifySize) * i + (h - 4) / 2, h / 2);
g2.setTransform(affine);
g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + (h - 4) / 2 - 10);
ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(j, i, verifySize));
g2.setComposite(ac3);
g2.drawOval(random.nextInt(w), random.nextInt(h), 5 + random.nextInt(10), 5 + random.nextInt(10));
gifEncoder.addFrame(image);
image.flush();
}
}
gifEncoder.finish();
g2.dispose();
}
else
{
for (int i = 0; i < verifySize; i++)
{
g2.setColor(getRandColor(100, 160));
g2.setFont(getRandomFont(h, type));
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * rd * (rb ? 1 : -1), (w / verifySize) * i + (h - 4) / 2, h / 2);
g2.setTransform(affine);
g2.drawOval(random.nextInt(w), random.nextInt(h), 5 + random.nextInt(10), 5 + random.nextInt(10));
g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + (h - 4) / 2 - 10);
}
g2.dispose();
ImageIO.write(image, "jpg", os);
}
}
/**
* 获取随机颜色
*
* @param fc
* @param bc
* @return
*/
private static Color getRandColor(int fc, int bc)
{
if (fc > 255)
{
fc = 255;
}
if (bc > 255)
{
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
private static int getRandomIntColor()
{
int[] rgb = getRandomRgb();
int color = 0;
for (int c : rgb)
{
color = color << 8;
color = color | c;
}
return color;
}
private static int[] getRandomRgb()
{
int[] rgb = new int[3];
for (int i = 0; i < 3; i++)
{
rgb[i] = random.nextInt(255);
}
return rgb;
}
/**
* 随机字体、随机风格、随机大小
*
* @param h
* 验证码图片高
* @return
*/
private static Font getRandomFont(int h, String type)
{
// 字体
String name = fontName[random.nextInt(fontName.length)];
// 字体样式
int style = fontStyle[random.nextInt(fontStyle.length)];
// 字体大小
int size = getRandomFontSize(h);
if (type.equals("login"))
{
return new Font(name, style, size);
}
else if (type.equals("coupons"))
{
return new Font(name, style, size);
}
else if (type.contains("3D"))
{
return new ImgFontByte().getFont(size, style);
}
else if (type.contains("mix"))
{
int flag = random.nextInt(10);
if (flag > 4)
{
return new Font(name, style, size);
}
else
{
return new ImgFontByte().getFont(size, style);
}
}
else
{
return new Font(name, style, size);
}
}
/**
* 干扰线按范围获取随机数
*
* @return
*/
private static int getRandomDrawLine()
{
int min = 20;
int max = 155;
Random random = new Random();
return random.nextInt(max) % (max - min + 1) + min;
}
/**
* 噪点数率按范围获取随机数
*
* @return
*/
private static float getRandomDrawPoint()
{
float min = 0.05f;
float max = 0.1f;
return min + ((max - min) * new Random().nextFloat());
}
/**
* 获取字体大小按范围随机
*
* @param h
* 验证码图片高
* @return
*/
private static int getRandomFontSize(int h)
{
int min = h - 8;
// int max = 46;
Random random = new Random();
return random.nextInt(11) + min;
}
/**
* 3D中空字体自定义属性类
*
* @author cgtu
* @date 2017年5月15日 下午3:27:52
*/
static class ImgFontByte
{
public Font getFont(int fontSize, int fontStype)
{
try
{
Font font = baseFont;
if (baseFont == null)
{
font = Font.createFont(Font.TRUETYPE_FONT, new ByteArrayInputStream(imgFontByte.hex2byte(imgFontByte.getFontByteStr())));
}
return font.deriveFont(fontStype, fontSize);
}
catch (Exception e)
{
return new Font("Arial", fontStype, fontSize);
}
}
private byte[] hex2byte(String str)
{
if (str == null)
return null;
str = str.trim();
int len = str.length();
if (len == 0 || len % 2 == 1)
return null;
byte[] b = new byte[len / 2];
try
{
for (int i = 0; i < str.length(); i += 2)
{
b[i / 2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();
}
return b;
}
catch (Exception e)
{
return null;
}
}
// 字体文件的十六进制字符串
private String getFontByteStr()
{
return "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}
}
/**
* 字符和干扰线扭曲
*
* @param g
* 绘制图形的java工具类
* @param w1
* 验证码图片宽
* @param h1
* 验证码图片高
* @param color
* 颜色
*/
private static void shear(Graphics g, int w1, int h1, Color color)
{
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
/**
* x轴扭曲
*
* @param g
* 绘制图形的java工具类
* @param w1
* 验证码图片宽
* @param h1
* 验证码图片高
* @param color
* 颜色
*/
private static void shearX(Graphics g, int w1, int h1, Color color)
{
int period = random.nextInt(2);
boolean borderGap = true;
int frames = 1;
int phase = random.nextInt(2);
for (int i = 0; i < h1; i++)
{
double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
if (borderGap)
{
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
}
/**
* y轴扭曲
*
* @param g
* 绘制图形的java工具类
* @param w1
* 验证码图片宽
* @param h1
* 验证码图片高
* @param color
* 颜色
*/
private static void shearY(Graphics g, int w1, int h1, Color color)
{
int period = random.nextInt(40) + 10; // 50;
boolean borderGap = true;
int frames = 20;
int phase = 7;
for (int i = 0; i < w1; i++)
{
double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
if (borderGap)
{
g.setColor(color);
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
}
/**
* 获取透明度,从0到1,自动计算步长
*
* @param i
* @param j
* @return float 透明度
*/
private static float getAlpha(int i, int j, int verifySize)
{
int num = i + j;
float r = (float) 1 / verifySize, s = (verifySize + 1) * r;
return num > verifySize ? (num * r - s) : num * r;
}
/**
* 生成指定验证码图像文件 - 本地测试生成图片查看效果
*
* @param w
* 验证码图片宽
* @param h
* 验证码图片高
* @param outputFile
* 文件流
* @param code
* 随机验证码
* @throws IOException
*/
public static void outputImage(int w, int h, File outputFile, String code) throws IOException
{
if (outputFile == null)
{
return;
}
File dir = outputFile.getParentFile();
if (!dir.exists())
{
dir.mkdirs();
}
try
{
outputFile.createNewFile();
FileOutputStream fos = new FileOutputStream(outputFile);
// outputImage(w, h, fos, code, "login"); //测试登录，噪点和干扰线为0.05f和20
// outputImage(w, h, fos, code, "coupons"); //测试领券，噪点和干扰线为范围随机值0.05f ~ 0.1f和20 ~ 155
// outputImage(w, h, fos, code, "3D"); //测试领券，噪点和干扰线为范围随机值0.05f ~ 0.1f和20 ~ 155
// outputImage(w, h, fos, code, "GIF"); //测试领券，噪点和干扰线为范围随机值0.05f ~ 0.1f和20 ~ 155
// outputImage(w, h, fos, code, "GIF3D"); //测试领券，噪点和干扰线为范围随机值0.05f ~ 0.1f和20 ~ 155
// outputImage(w, h, fos, code, "mix2"); //测试领券，噪点和干扰线为范围随机值0.05f ~ 0.1f和20 ~ 155
outputImage(w, h, fos, code, "mixGIF"); // 测试领券，噪点和干扰线为范围随机值0.05f ~ 0.1f和20 ~ 155
fos.close();
}
catch (IOException e)
{
throw e;
}
}
/**
* 本地测试类，可以生成样例验证码图片供观看效果
*
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException
{
File dir = new File("E:/logtest/verifies8");
int w = 120, h = 48;
for (int i = 0; i < 150; i++)
{
String verifyCode = generateVerifyCode(4);
File file = new File(dir, verifyCode + ".gif");
outputImage(w, h, file, verifyCode);
}
}
}调用的地方随机获取验证码样式： 分布式可以存放在redis
public class ValiCodeServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
/** 验证码缓存key */
public static final String RANDOMCODEKEY = "RANDOMCODEKEY";
private static final Logger logger = Logger.getLogger(ValiCodeServlet.class);
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
response.setContentType("image/jpeg");
// 设置相应类型,告诉浏览器输出的内容为图片
response.setHeader("Pragma", "No-cache");
// 设置响应头信息，告诉浏览器不要缓存此内容
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expire", 0);
try
{
// 生成随机验证码
int charSize = 4;
String verifyCode = RandomVerifyImgCodeUtil.generateVerifyCode(charSize);
if (StringUtils.isNotBlank(verifyCode))
{
RedisUtil redisUtil = SpringContextUtils.getBean(RedisUtil.class);
String key = request.getSession().getId() + "_" + RANDOMCODEKEY;
redisUtil.set(key, verifyCode.toString());
/** 设置sesionTooken,90s后失效 **/
redisUtil.expired(key, 90);
// 再次存cookie备份
CookieUtil.addCookie(request, response, RANDOMCODEKEY, verifyCode, 300);
}
// 生成图片规格w宽 h高
int w = 100, h = 40;
int type = new Random().nextInt(7);
if (type == 0)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "login");
}
else if (type == 1)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "GIF");
}
else if (type == 2)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "3D");
}
else if (type == 3)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "GIF3D");
}
else if (type == 4)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "mix2");
}
else if (type == 5)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "mixGIF");
}
else if (type == 6)
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "coupons");
}
else
{
RandomVerifyImgCodeUtil.outputImage(w, h, response.getOutputStream(), verifyCode, "mixGIF");
}
}
catch (Exception e)
{
logger.error(e.getMessage(), e);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
doGet(request, response);
}
}GIF格式的老外的工具类： Encoder
package com.test;
import java.io.IOException;
import java.io.OutputStream;
/**
* @author: wuhongjun
* @version:1.0
*/
public class Encoder
{
private static final int EOF = -1;
private int imgW, imgH;
private byte[] pixAry;
private int initCodeSize;
private int remaining;
private int curPixel;
// GIFCOMPR.C - GIF Image compression routines
//
// Lempel-Ziv compression based on 'compress'. GIF modifications by
// David Rowley (mgardi@watdcsu.waterloo.edu)
// General DEFINEs
static final int BITS = 12;
static final int HSIZE = 5003; // 80% occupancy
// GIF Image compression - modified 'compress'
//
// Based on: compress.c - File compression ala IEEE Computer, June 1984.
//
// By Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas)
// Jim McKie (decvax!mcvax!jim)
// Steve Davies (decvax!vax135!petsd!peora!srd)
// Ken Turkowski (decvax!decwrl!turtlevax!ken)
// James A. Woods (decvax!ihnp4!ames!jaw)
// Joe Orost (decvax!vax135!petsd!joe)
int n_bits; // number of bits/code
int maxbits = BITS; // user settable max # bits/code
int maxcode; // maximum code, given n_bits
int maxmaxcode = 1 << BITS; // should NEVER generate this code
int[] htab = new int[HSIZE];
int[] codetab = new int[HSIZE];
int hsize = HSIZE; // for dynamic table sizing
int free_ent = 0; // first unused entry
// block compression parameters -- after all codes are used up,
// and compression rate changes, start over.
boolean clear_flg = false;
// Algorithm: use open addressing double hashing (no chaining) on the
// prefix code / next character combination. We do a variant of Knuth's
// algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
// secondary probe. Here, the modular division first probe is gives way
// to a faster exclusive-or manipulation. Also do block compression with
// an adaptive reset, whereby the code table is cleared when the compression
// ratio decreases, but after the table fills. The variable-length output
// codes are re-sized at this point, and a special CLEAR code is generated
// for the decompressor. Late addition: construct the table according to
// file size for noticeable speed improvement on small files. Please direct
// questions about this implementation to ames!jaw.
int g_init_bits;
int ClearCode;
int EOFCode;
// output
//
// Output the given code.
// Inputs:
// code: A n_bits-bit integer. If == -1, then EOF. This assumes
// that n_bits =< wordsize - 1.
// Outputs:
// Outputs code to the file.
// Assumptions:
// Chars are 8 bits long.
// Algorithm:
// Maintain a BITS character long buffer (so that 8 codes will
// fit in it exactly). Use the VAX insv instruction to insert each
// code in turn. When the buffer fills up empty it and start over.
int cur_accum = 0;
int cur_bits = 0;
int masks[] =
{
0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF
};
// Number of characters so far in this 'packet'
int a_count;
// Define the storage for the packet accumulator
byte[] accum = new byte[256];
// ----------------------------------------------------------------------------
Encoder(int width, int height, byte[] pixels, int color_depth)
{
imgW = width;
imgH = height;
pixAry = pixels;
initCodeSize = Math.max(2, color_depth);
}
// Add a character to the end of the current packet, and if it is 254
// characters, flush the packet to disk.
void char_out(byte c, OutputStream outs) throws IOException
{
accum[a_count++] = c;
if (a_count >= 254)
flush_char(outs);
}
// Clear out the hash table
// table clear for block compress
void cl_block(OutputStream outs) throws IOException
{
cl_hash(hsize);
free_ent = ClearCode + 2;
clear_flg = true;
output(ClearCode, outs);
}
// reset code table
void cl_hash(int hsize)
{
for (int i = 0; i < hsize; ++i)
htab[i] = -1;
}
void compress(int init_bits, OutputStream outs) throws IOException
{
int fcode;
int i /* = 0 */;
int c;
int ent;
int disp;
int hsize_reg;
int hshift;
// Set up the globals: g_init_bits - initial number of bits
g_init_bits = init_bits;
// Set up the necessary values
clear_flg = false;
n_bits = g_init_bits;
maxcode = MAXCODE(n_bits);
ClearCode = 1 << (init_bits - 1);
EOFCode = ClearCode + 1;
free_ent = ClearCode + 2;
a_count = 0; // clear packet
ent = nextPixel();
hshift = 0;
for (fcode = hsize; fcode < 65536; fcode *= 2)
++hshift;
hshift = 8 - hshift; // set hash code range bound
hsize_reg = hsize;
cl_hash(hsize_reg); // clear hash table
output(ClearCode, outs);
outer_loop: while ((c = nextPixel()) != EOF)
{
fcode = (c << maxbits) + ent;
i = (c << hshift) ^ ent; // xor hashing
if (htab[i] == fcode)
{
ent = codetab[i];
continue;
}
else if (htab[i] >= 0) // non-empty slot
{
disp = hsize_reg - i; // secondary hash (after G. Knott)
if (i == 0)
disp = 1;
do
{
if ((i -= disp) < 0)
i += hsize_reg;
if (htab[i] == fcode)
{
ent = codetab[i];
continue outer_loop;
}
}
while (htab[i] >= 0);
}
output(ent, outs);
ent = c;
if (free_ent < maxmaxcode)
{
codetab[i] = free_ent++; // code -> hashtable
htab[i] = fcode;
}
else
cl_block(outs);
}
// Put out the final code.
output(ent, outs);
output(EOFCode, outs);
}
// ----------------------------------------------------------------------------
void encode(OutputStream os) throws IOException
{
os.write(initCodeSize); // write "initial code size" byte
remaining = imgW * imgH; // reset navigation variables
curPixel = 0;
compress(initCodeSize + 1, os); // compress and write the pixel data
os.write(0); // write block terminator
}
// Flush the packet to disk, and reset the accumulator
void flush_char(OutputStream outs) throws IOException
{
if (a_count > 0)
{
outs.write(a_count);
outs.write(accum, 0, a_count);
a_count = 0;
}
}
final int MAXCODE(int n_bits)
{
return (1 << n_bits) - 1;
}
// ----------------------------------------------------------------------------
// Return the next pixel from the image
// ----------------------------------------------------------------------------
private int nextPixel()
{
if (remaining == 0)
return EOF;
--remaining;
byte pix = pixAry[curPixel++];
return pix & 0xff;
}
void output(int code, OutputStream outs) throws IOException
{
cur_accum &= masks[cur_bits];
if (cur_bits > 0)
cur_accum |= (code << cur_bits);
else
cur_accum = code;
cur_bits += n_bits;
while (cur_bits >= 8)
{
char_out((byte) (cur_accum & 0xff), outs);
cur_accum >>= 8;
cur_bits -= 8;
}
// If the next entry is going to be too big for the code size,
// then increase it, if possible.
if (free_ent > maxcode || clear_flg)
{
if (clear_flg)
{
maxcode = MAXCODE(n_bits = g_init_bits);
clear_flg = false;
}
else
{
++n_bits;
if (n_bits == maxbits)
maxcode = maxmaxcode;
else
maxcode = MAXCODE(n_bits);
}
}
if (code == EOFCode)
{
// At EOF, write the rest of the buffer.
while (cur_bits > 0)
{
char_out((byte) (cur_accum & 0xff), outs);
cur_accum >>= 8;
cur_bits -= 8;
}
flush_char(outs);
}
}
}GifDecoder：
package com.test;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
/**
* <p>
* </p>
*
* @author: wuhongjun
* @version:1.0
*/
public class GifDecoder
{
/**
* File read status: No errors.
*/
public static final int STATUS_OK = 0;
/**
* File read status: Error decoding file (may be partially decoded)
*/
public static final int STATUS_FORMAT_ERROR = 1;
/**
* File read status: Unable to open source.
*/
public static final int STATUS_OPEN_ERROR = 2;
protected BufferedInputStream in;
protected int status;
protected int width; // full image width
protected int height; // full image height
protected boolean gctFlag; // global color table used
protected int gctSize; // size of global color table
protected int loopCount = 1; // iterations; 0 = repeat forever
protected int[] gct; // global color table
protected int[] lct; // local color table
protected int[] act; // active color table
protected int bgIndex; // background color index
protected int bgColor; // background color
protected int lastBgColor; // previous bg color
protected int pixelAspect; // pixel aspect ratio
protected boolean lctFlag; // local color table flag
protected boolean interlace; // interlace flag
protected int lctSize; // local color table size
protected int ix, iy, iw, ih; // current image rectangle
protected Rectangle lastRect; // last image rect
protected BufferedImage image; // current frame
protected BufferedImage lastImage; // previous frame
protected byte[] block = new byte[256]; // current data block
protected int blockSize = 0; // block size
// last graphic control extension info
protected int dispose = 0;
// 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
protected int lastDispose = 0;
protected boolean transparency = false; // use transparent color
protected int delay = 0; // delay in milliseconds
protected int transIndex; // transparent color index
protected static final int MaxStackSize = 4096;
// max decoder pixel stack size
// LZW decoder working arrays
protected short[] prefix;
protected byte[] suffix;
protected byte[] pixelStack;
protected byte[] pixels;
protected ArrayList<GifFrame> frames; // frames read from current file
protected int frameCount;
static class GifFrame
{
public GifFrame(BufferedImage im, int del)
{
image = im;
delay = del;
}
public BufferedImage image;
public int delay;
}
/**
* Gets display duration for specified frame.
*
* @param n
* int index of frame
* @return delay in milliseconds
*/
public int getDelay(int n)
{
//
delay = -1;
if ((n >= 0) && (n < frameCount))
{
delay = (frames.get(n)).delay;
}
return delay;
}
/**
* Gets the number of frames read from file.
*
* @return frame count
*/
public int getFrameCount()
{
return frameCount;
}
/**
* Gets the first (or only) image read.
*
* @return BufferedImage containing first frame, or null if none.
*/
public BufferedImage getImage()
{
return getFrame(0);
}
/**
* Gets the "Netscape" iteration count, if any.
* A count of 0 means repeat indefinitiely.
*
* @return iteration count if one was specified, else 1.
*/
public int getLoopCount()
{
return loopCount;
}
/**
* Creates new frame image from current data (and previous
* frames as specified by their disposition codes).
*/
protected void setPixels()
{
// expose destination image's pixels as int array
int[] dest = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
// fill in starting image contents based on last image's dispose code
if (lastDispose > 0)
{
if (lastDispose == 3)
{
// use image before last
int n = frameCount - 2;
if (n > 0)
{
lastImage = getFrame(n - 1);
}
else
{
lastImage = null;
}
}
if (lastImage != null)
{
int[] prev = ((DataBufferInt) lastImage.getRaster().getDataBuffer()).getData();
System.arraycopy(prev, 0, dest, 0, width * height);
// copy pixels
if (lastDispose == 2)
{
// fill last image rect area with background color
Graphics2D g = image.createGraphics();
Color c = null;
if (transparency)
{
c = new Color(0, 0, 0, 0); // assume background is transparent
}
else
{
c = new Color(lastBgColor); // use given background color
}
g.setColor(c);
g.setComposite(AlphaComposite.Src); // replace area
g.fill(lastRect);
g.dispose();
}
}
}
// copy each source line to the appropriate place in the destination
int pass = 1;
int inc = 8;
int iline = 0;
for (int i = 0; i < ih; i++)
{
int line = i;
if (interlace)
{
if (iline >= ih)
{
pass++;
switch (pass)
{
case 2:
iline = 4;
break;
case 3:
iline = 2;
inc = 4;
break;
case 4:
iline = 1;
inc = 2;
}
}
line = iline;
iline += inc;
}
line += iy;
if (line < height)
{
int k = line * width;
int dx = k + ix; // start of line in dest
int dlim = dx + iw; // end of dest line
if ((k + width) < dlim)
{
dlim = k + width; // past dest edge
}
int sx = i * iw; // start of line in source
while (dx < dlim)
{
// map color and insert in destination
int index = ((int) pixels[sx++]) & 0xff;
int c = act[index];
if (c != 0)
{
dest[dx] = c;
}
dx++;
}
}
}
}
/**
* Gets the image contents of frame n.
*
* @return BufferedImage representation of frame, or null if n is invalid.
*/
public BufferedImage getFrame(int n)
{
BufferedImage im = null;
if ((n >= 0) && (n < frameCount))
{
im = (frames.get(n)).image;
}
return im;
}
/**
* Gets image size.
*
* @return GIF image dimensions
*/
public Dimension getFrameSize()
{
return new Dimension(width, height);
}
/**
* Reads GIF image from stream
*
* @param is
* BufferedInputStream containing GIF file.
* @return read status code (0 = no errors)
*/
public int read(BufferedInputStream is)
{
init();
try
{
if (is != null)
{
in = is;
readHeader();
if (!err())
{
readContents();
if (frameCount < 0)
{
status = STATUS_FORMAT_ERROR;
}
}
}
else
{
status = STATUS_OPEN_ERROR;
}
}
finally
{
if (null != is)
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
return status;
}
/**
* Reads GIF image from stream
*
* @param is
* InputStream containing GIF file.
* @return read status code (0 = no errors)
*/
public int read(InputStream is)
{
init();
try
{
if (is != null)
{
if (!(is instanceof BufferedInputStream))
is = new BufferedInputStream(is);
in = (BufferedInputStream) is;
readHeader();
if (!err())
{
readContents();
if (frameCount < 0)
{
status = STATUS_FORMAT_ERROR;
}
}
}
else
{
status = STATUS_OPEN_ERROR;
}
}
finally
{
if (null != is)
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
return status;
}
/**
* Reads GIF file from specified file/URL source
* (URL assumed if name contains ":/" or "file:")
*
* @param name
* String containing source
* @return read status code (0 = no errors)
*/
public int read(String name)
{
status = STATUS_OK;
try
{
name = name.trim().toLowerCase();
if ((name.contains("file:")) || (name.indexOf(":/") > 0))
{
URL url = new URL(name);
in = new BufferedInputStream(url.openStream());
}
else
{
in = new BufferedInputStream(new FileInputStream(name));
}
status = read(in);
}
catch (IOException e)
{
status = STATUS_OPEN_ERROR;
}
return status;
}
/**
* Decodes LZW image data into pixel array.
* Adapted from John Cristy's ImageMagick.
*/
protected void decodeImageData()
{
int NullCode = -1;
int npix = iw * ih;
int available, clear, code_mask, code_size, end_of_information, in_code, old_code, bits, code, count, i, datum, data_size, first, top, bi, pi;
if ((pixels == null) || (pixels.length < npix))
{
pixels = new byte[npix]; // allocate new pixel array
}
if (prefix == null)
prefix = new short[MaxStackSize];
if (suffix == null)
suffix = new byte[MaxStackSize];
if (pixelStack == null)
pixelStack = new byte[MaxStackSize + 1];
// Initialize GIF data stream decoder.
data_size = read();
clear = 1 << data_size;
end_of_information = clear + 1;
available = clear + 2;
old_code = NullCode;
code_size = data_size + 1;
code_mask = (1 << code_size) - 1;
for (code = 0; code < clear; code++)
{
prefix[code] = 0;
suffix[code] = (byte) code;
}
// Decode GIF pixel stream.
datum = bits = count = first = top = pi = bi = 0;
for (i = 0; i < npix;)
{
if (top == 0)
{
if (bits < code_size)
{
// Load bytes until there are enough bits for a code.
if (count == 0)
{
// Read a new data block.
count = readBlock();
if (count <= 0)
break;
bi = 0;
}
datum += (((int) block[bi]) & 0xff) << bits;
bits += 8;
bi++;
count--;
continue;
}
// Get the next code.
code = datum & code_mask;
datum >>= code_size;
bits -= code_size;
// Interpret the code
if ((code > available) || (code == end_of_information))
break;
if (code == clear)
{
// Reset decoder.
code_size = data_size + 1;
code_mask = (1 << code_size) - 1;
available = clear + 2;
old_code = NullCode;
continue;
}
if (old_code == NullCode)
{
pixelStack[top++] = suffix[code];
old_code = code;
first = code;
continue;
}
in_code = code;
if (code == available)
{
pixelStack[top++] = (byte) first;
code = old_code;
}
while (code > clear)
{
pixelStack[top++] = suffix[code];
code = prefix[code];
}
first = ((int) suffix[code]) & 0xff;
// Add a new string to the string table,
if (available >= MaxStackSize)
break;
pixelStack[top++] = (byte) first;
prefix[available] = (short) old_code;
suffix[available] = (byte) first;
available++;
if (((available & code_mask) == 0) && (available < MaxStackSize))
{
code_size++;
code_mask += available;
}
old_code = in_code;
}
// Pop a pixel off the pixel stack.
top--;
pixels[pi++] = pixelStack[top];
i++;
}
for (i = pi; i < npix; i++)
{
pixels[i] = 0; // clear missing pixels
}
}
/**
* Returns true if an error was encountered during reading/decoding
*/
protected boolean err()
{
return status != STATUS_OK;
}
/**
* Initializes or re-initializes reader
*/
protected void init()
{
status = STATUS_OK;
frameCount = 0;
frames = new ArrayList<GifFrame>();
gct = null;
lct = null;
}
/**
* Reads a single byte from the input stream.
*/
protected int read()
{
int curByte = 0;
try
{
curByte = in.read();
}
catch (IOException e)
{
status = STATUS_FORMAT_ERROR;
}
return curByte;
}
/**
* Reads next variable length block from input.
*
* @return number of bytes stored in "buffer"
*/
protected int readBlock()
{
blockSize = read();
int n = 0;
if (blockSize > 0)
{
try
{
int count = 0;
while (n < blockSize)
{
count = in.read(block, n, blockSize - n);
if (count == -1)
break;
n += count;
}
}
catch (IOException ignored)
{
}
if (n < blockSize)
{
status = STATUS_FORMAT_ERROR;
}
}
return n;
}
/**
* Reads color table as 256 RGB integer values
*
* @param ncolors
* int number of colors to read
* @return int array containing 256 colors (packed ARGB with full alpha)
*/
protected int[] readColorTable(int ncolors)
{
int nbytes = 3 * ncolors;
int[] tab = null;
byte[] c = new byte[nbytes];
int n = 0;
try
{
n = in.read(c);
}
catch (IOException ignored)
{
}
if (n < nbytes)
{
status = STATUS_FORMAT_ERROR;
}
else
{
tab = new int[256]; // max size to avoid bounds checks
int i = 0;
int j = 0;
while (i < ncolors)
{
int r = ((int) c[j++]) & 0xff;
int g = ((int) c[j++]) & 0xff;
int b = ((int) c[j++]) & 0xff;
tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b;
}
}
return tab;
}
/**
* Main file parser. Reads GIF content blocks.
*/
protected void readContents()
{
// read GIF file content blocks
boolean done = false;
while (!(done || err()))
{
int code = read();
switch (code)
{
case 0x2C: // image separator
readImage();
break;
case 0x21: // extension
code = read();
switch (code)
{
case 0xf9: // graphics control extension
readGraphicControlExt();
break;
case 0xff: // application extension
readBlock();
String app = "";
for (int i = 0; i < 11; i++)
{
app += (char) block[i];
}
if (app.equals("NETSCAPE2.0"))
{
readNetscapeExt();
}
else
skip(); // don't care
break;
default: // uninteresting extension
skip();
}
break;
case 0x3b: // terminator
done = true;
break;
case 0x00: // bad byte, but keep going and see what happens
break;
default:
status = STATUS_FORMAT_ERROR;
}
}
}
/**
* Reads Graphics Control Extension values
*/
protected void readGraphicControlExt()
{
read(); // block size
int packed = read(); // packed fields
dispose = (packed & 0x1c) >> 2; // disposal method
if (dispose == 0)
{
dispose = 1; // elect to keep old image if discretionary
}
transparency = (packed & 1) != 0;
delay = readShort() * 10; // delay in milliseconds
transIndex = read(); // transparent color index
read(); // block terminator
}
/**
* Reads GIF file header information.
*/
protected void readHeader()
{
String id = "";
for (int i = 0; i < 6; i++)
{
id += (char) read();
}
if (!id.startsWith("GIF"))
{
status = STATUS_FORMAT_ERROR;
return;
}
readLSD();
if (gctFlag && !err())
{
gct = readColorTable(gctSize);
bgColor = gct[bgIndex];
}
}
/**
* Reads next frame image
*/
protected void readImage()
{
ix = readShort(); // (sub)image position & size
iy = readShort();
iw = readShort();
ih = readShort();
int packed = read();
lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
interlace = (packed & 0x40) != 0; // 2 - interlace flag
// 3 - sort flag
// 4-5 - reserved
lctSize = 2 << (packed & 7); // 6-8 - local color table size
if (lctFlag)
{
lct = readColorTable(lctSize); // read table
act = lct; // make local table active
}
else
{
act = gct; // make global table active
if (bgIndex == transIndex)
bgColor = 0;
}
int save = 0;
if (transparency)
{
save = act[transIndex];
act[transIndex] = 0; // set transparent color if specified
}
if (act == null)
{
status = STATUS_FORMAT_ERROR; // no color table defined
}
if (err())
return;
decodeImageData(); // decode pixel data
skip();
if (err())
return;
frameCount++;
// create new image to receive frame data
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB_PRE);
setPixels(); // transfer pixel data to image
frames.add(new GifFrame(image, delay)); // add image to frame list
if (transparency)
{
act[transIndex] = save;
}
resetFrame();
}
/**
* Reads Logical Screen Descriptor
*/
protected void readLSD()
{
// logical screen size
width = readShort();
height = readShort();
// packed fields
int packed = read();
gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
// 2-4 : color resolution
// 5 : gct sort flag
gctSize = 2 << (packed & 7); // 6-8 : gct size
bgIndex = read(); // background color index
pixelAspect = read(); // pixel aspect ratio
}
/**
* Reads Netscape extenstion to obtain iteration count
*/
protected void readNetscapeExt()
{
do
{
readBlock();
if (block[0] == 1)
{
// loop count sub-block
int b1 = ((int) block[1]) & 0xff;
int b2 = ((int) block[2]) & 0xff;
loopCount = (b2 << 8) | b1;
}
}
while ((blockSize > 0) && !err());
}
/**
* Reads next 16-bit value, LSB first
*/
protected int readShort()
{
// read 16-bit value, LSB first
return read() | (read() << 8);
}
/**
* Resets frame state for reading next image.
*/
protected void resetFrame()
{
lastDispose = dispose;
lastRect = new Rectangle(ix, iy, iw, ih);
lastImage = image;
lastBgColor = bgColor;
int dispose = 0;
boolean transparency = false;
int delay = 0;
lct = null;
}
/**
* Skips variable length blocks up to and including
* next zero length block.
*/
protected void skip()
{
do
{
readBlock();
}
while ((blockSize > 0) && !err());
}
}GifEncoder：
package com.test;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Class AnimatedGifEncoder - Encodes a GIF file consisting of one or
* more frames.
*
* <pre>
* Example:
* AnimatedGifEncoder e = new AnimatedGifEncoder();
* e.start(outputFileName);
* e.setDelay(1000); // 1 frame per sec
* e.addFrame(image1);
* e.addFrame(image2);
* e.finish();
* </pre>
*
* No copyright asserted on the source code of this class. May be used
* for any purpose, however, refer to the Unisys LZW patent for restrictions
* on use of the associated Encoder class. Please forward any corrections
* to questions at fmsware.com.
*
* @author wuhongjun
* @version 1.03 November 2003
*/
public class GifEncoder
{
protected int width; // image size
protected int height;
protected Color transparent = null; // transparent color if given
protected int transIndex; // transparent index in color table
protected int repeat = -1; // no repeat
protected int delay = 0; // frame delay (hundredths)
protected boolean started = false; // ready to output frames
protected OutputStream out;
protected BufferedImage image; // current frame
protected byte[] pixels; // BGR byte array from frame
protected byte[] indexedPixels; // converted frame indexed to palette
protected int colorDepth; // number of bit planes
protected byte[] colorTab; // RGB palette
protected boolean[] usedEntry = new boolean[256]; // active palette entries
protected int palSize = 7; // color table size (bits-1)
protected int dispose = -1; // disposal code (-1 = use default)
protected boolean closeStream = false; // close stream when finished
protected boolean firstFrame = true;
protected boolean sizeSet = false; // if false, get size from first frame
protected int sample = 10; // default sample interval for quantizer
/**
* Sets the delay time between each frame, or changes it
* for subsequent frames (applies to last frame added).
*
* @param ms
* int delay time in milliseconds
*/
public void setDelay(int ms)
{
delay = Math.round(ms / 10.0f);
}
/**
* Sets the GIF frame disposal code for the last added frame
* and any subsequent frames. Default is 0 if no transparent
* color has been set, otherwise 2.
*
* @param code
* int disposal code.
*/
public void setDispose(int code)
{
if (code >= 0)
{
dispose = code;
}
}
/**
* Sets the number of times the set of GIF frames
* should be played. Default is 1; 0 means play
* indefinitely. Must be invoked before the first
* image is added.
*
* @param iter
* int number of iterations.
* @return
*/
public void setRepeat(int iter)
{
if (iter >= 0)
{
repeat = iter;
}
}
/**
* Sets the transparent color for the last added frame
* and any subsequent frames.
* Since all colors are subject to modification
* in the quantization process, the color in the final
* palette for each frame closest to the given color
* becomes the transparent color for that frame.
* May be set to null to indicate no transparent color.
*
* @param c
* Color to be treated as transparent on display.
*/
public void setTransparent(Color c)
{
transparent = c;
}
/**
* Adds next GIF frame. The frame is not written immediately, but is
* actually deferred until the next frame is received so that timing
* data can be inserted. Invoking <code>finish()</code> flushes all
* frames. If <code>setSize</code> was not invoked, the size of the
* first image is used for all subsequent frames.
*
* @param im
* BufferedImage containing frame to write.
* @return true if successful.
*/
public boolean addFrame(BufferedImage im)
{
if ((im == null) || !started)
{
return false;
}
boolean ok = true;
try
{
if (!sizeSet)
{
// use first frame's size
setSize(im.getWidth(), im.getHeight());
}
image = im;
getImagePixels(); // convert to correct format if necessary
analyzePixels(); // build color table & map pixels
if (firstFrame)
{
writeLSD(); // logical screen descriptior
writePalette(); // global color table
if (repeat >= 0)
{
// use NS app extension to indicate reps
writeNetscapeExt();
}
}
writeGraphicCtrlExt(); // write graphic control extension
writeImageDesc(); // image descriptor
if (!firstFrame)
{
writePalette(); // local color table
}
writePixels(); // encode and write pixel data
firstFrame = false;
}
catch (IOException e)
{
ok = false;
}
return ok;
}
// added by alvaro
public boolean outFlush()
{
boolean ok = true;
try
{
out.flush();
return ok;
}
catch (IOException e)
{
ok = false;
}
return ok;
}
public byte[] getFrameByteArray()
{
return ((ByteArrayOutputStream) out).toByteArray();
}
/**
* Flushes any pending data and closes output file.
* If writing to an OutputStream, the stream is not
* closed.
*/
public boolean finish()
{
if (!started)
return false;
boolean ok = true;
started = false;
try
{
out.write(0x3b); // gif trailer
out.flush();
if (closeStream)
{
out.close();
}
}
catch (IOException e)
{
ok = false;
}
return ok;
}
public void reset()
{
// reset for subsequent use
transIndex = 0;
out = null;
image = null;
pixels = null;
indexedPixels = null;
colorTab = null;
closeStream = false;
firstFrame = true;
}
/**
* Sets frame rate in frames per second. Equivalent to
* <code>setDelay(1000/fps)</code>.
*
* @param fps
* float frame rate (frames per second)
*/
public void setFrameRate(float fps)
{
if (fps != 0f)
{
delay = Math.round(100f / fps);
}
}
/**
* Sets quality of color quantization (conversion of images
* to the maximum 256 colors allowed by the GIF specification).
* Lower values (minimum = 1) produce better colors, but slow
* processing significantly. 10 is the default, and produces
* good color mapping at reasonable speeds. Values greater
* than 20 do not yield significant improvements in speed.
*
* @param quality
* int greater than 0.
* @return
*/
public void setQuality(int quality)
{
if (quality < 1)
quality = 1;
sample = quality;
}
/**
* Sets the GIF frame size. The default size is the
* size of the first frame added if this method is
* not invoked.
*
* @param w
* int frame width.
* @param h
* int frame width.
*/
public void setSize(int w, int h)
{
if (started && !firstFrame)
return;
width = w;
height = h;
if (width < 1)
width = 320;
if (height < 1)
height = 240;
sizeSet = true;
}
/**
* Initiates GIF file creation on the given stream. The stream
* is not closed automatically.
*
* @param os
* OutputStream on which GIF images are written.
* @return false if initial write failed.
*/
public boolean start(OutputStream os)
{
if (os == null)
return false;
boolean ok = true;
closeStream = false;
out = os;
try
{
writeString("GIF89a"); // header
}
catch (IOException e)
{
ok = false;
}
return started = ok;
}
/**
* Initiates writing of a GIF file with the specified name.
*
* @param file
* String containing output file name.
* @return false if open or initial write failed.
*/
public boolean start(String file)
{
boolean ok = true;
try
{
out = new BufferedOutputStream(new FileOutputStream(file));
ok = start(out);
closeStream = true;
}
catch (IOException e)
{
ok = false;
}
return started = ok;
}
/**
* Analyzes image colors and creates color map.
*/
protected void analyzePixels()
{
int len = pixels.length;
int nPix = len / 3;
indexedPixels = new byte[nPix];
Quant nq = new Quant(pixels, len, sample);
// initialize quantizer
colorTab = nq.process(); // create reduced palette
// convert map from BGR to RGB
for (int i = 0; i < colorTab.length; i += 3)
{
byte temp = colorTab[i];
colorTab[i] = colorTab[i + 2];
colorTab[i + 2] = temp;
usedEntry[i / 3] = false;
}
// map image pixels to new palette
int k = 0;
for (int i = 0; i < nPix; i++)
{
int index = nq.map(pixels[k++] & 0xff, pixels[k++] & 0xff, pixels[k++] & 0xff);
usedEntry[index] = true;
indexedPixels[i] = (byte) index;
}
pixels = null;
colorDepth = 8;
palSize = 7;
// get closest match to transparent color if specified
if (transparent != null)
{
transIndex = findClosest(transparent);
}
}
/**
* Returns index of palette color closest to c
*/
protected int findClosest(Color c)
{
if (colorTab == null)
return -1;
int r = c.getRed();
int g = c.getGreen();
int b = c.getBlue();
int minpos = 0;
int dmin = 256 * 256 * 256;
int len = colorTab.length;
for (int i = 0; i < len;)
{
int dr = r - (colorTab[i++] & 0xff);
int dg = g - (colorTab[i++] & 0xff);
int db = b - (colorTab[i] & 0xff);
int d = dr * dr + dg * dg + db * db;
int index = i / 3;
if (usedEntry[index] && (d < dmin))
{
dmin = d;
minpos = index;
}
i++;
}
return minpos;
}
/**
* Extracts image pixels into byte array "pixels"
*/
protected void getImagePixels()
{
int w = image.getWidth();
int h = image.getHeight();
int type = image.getType();
if ((w != width) || (h != height) || (type != BufferedImage.TYPE_3BYTE_BGR))
{
// create new image with right size/format
BufferedImage temp = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g = temp.createGraphics();
g.drawImage(image, 0, 0, null);
image = temp;
}
pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
}
/**
* Writes Graphic Control Extension
*/
protected void writeGraphicCtrlExt() throws IOException
{
out.write(0x21); // extension introducer
out.write(0xf9); // GCE label
out.write(4); // data block size
int transp, disp;
if (transparent == null)
{
transp = 0;
disp = 0; // dispose = no action
}
else
{
transp = 1;
disp = 2; // force clear if using transparent color
}
if (dispose >= 0)
{
disp = dispose & 7; // user override
}
disp <<= 2;
// packed fields
out.write(0 | // 1:3 reserved
disp | // 4:6 disposal
0 | // 7 user input - 0 = none
transp); // 8 transparency flag
writeShort(delay); // delay x 1/100 sec
out.write(transIndex); // transparent color index
out.write(0); // block terminator
}
/**
* Writes Image Descriptor
*/
protected void writeImageDesc() throws IOException
{
out.write(0x2c); // image separator
writeShort(0); // image position x,y = 0,0
writeShort(0);
writeShort(width); // image size
writeShort(height);
// packed fields
if (firstFrame)
{
// no LCT - GCT is used for first (or only) frame
out.write(0);
}
else
{
// specify normal LCT
out.write(0x80 | // 1 local color table 1=yes
0 | // 2 interlace - 0=no
0 | // 3 sorted - 0=no
0 | // 4-5 reserved
palSize); // 6-8 size of color table
}
}
/**
* Writes Logical Screen Descriptor
*/
protected void writeLSD() throws IOException
{
// logical screen size
writeShort(width);
writeShort(height);
// packed fields
out.write((0x80 | // 1 : global color table flag = 1 (gct used)
0x70 | // 2-4 : color resolution = 7
0x00 | // 5 : gct sort flag = 0
palSize)); // 6-8 : gct size
out.write(0); // background color index
out.write(0); // pixel aspect ratio - assume 1:1
}
/**
* Writes Netscape application extension to define
* repeat count.
*/
protected void writeNetscapeExt() throws IOException
{
out.write(0x21); // extension introducer
out.write(0xff); // app extension label
out.write(11); // block size
writeString("NETSCAPE" + "2.0"); // app id + auth code
out.write(3); // sub-block size
out.write(1); // loop sub-block id
writeShort(repeat); // loop count (extra iterations, 0=repeat forever)
out.write(0); // block terminator
}
/**
* Writes color table
*/
protected void writePalette() throws IOException
{
out.write(colorTab, 0, colorTab.length);
int n = (3 * 256) - colorTab.length;
for (int i = 0; i < n; i++)
{
out.write(0);
}
}
/**
* Encodes and writes pixel data
*/
protected void writePixels() throws IOException
{
Encoder encoder = new Encoder(width, height, indexedPixels, colorDepth);
encoder.encode(out);
}
/**
* Write 16-bit value to output stream, LSB first
*/
protected void writeShort(int value) throws IOException
{
out.write(value & 0xff);
out.write((value >> 8) & 0xff);
}
/**
* Writes string to output stream
*/
protected void writeString(String s) throws IOException
{
for (int i = 0; i < s.length(); i++)
{
out.write((byte) s.charAt(i));
}
}
}Quant:
package com.test;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
/**
* <p>
* </p>
*
* @author: wuhongjun
* @version:1.0
*/
public class Quant
{
protected static final int netsize = 256; /* number of colours used */
/* four primes near 500 - assume no image has a length so large */
/* that it is divisible by all four primes */
protected static final int prime1 = 499;
protected static final int prime2 = 491;
protected static final int prime3 = 487;
protected static final int prime4 = 503;
protected static final int minpicturebytes = (3 * prime4);
/* minimum size for input image */
/*
* Program Skeleton
* ----------------
* [select samplefac in range 1..30]
* [read image from input file]
* pic = (unsigned char*) malloc(3*width*height);
* initnet(pic,3*width*height,samplefac);
* learn();
* unbiasnet();
* [write output image header, using writecolourmap(f)]
* inxbuild();
* write output image using inxsearch(b,g,r)
*/
/*
* Network Definitions
* -------------------
*/
protected static final int maxnetpos = (netsize - 1);
protected static final int netbiasshift = 4; /* bias for colour values */
protected static final int ncycles = 100; /* no. of learning cycles */
/* defs for freq and bias */
protected static final int intbiasshift = 16; /* bias for fractions */
protected static final int intbias = (((int) 1) << intbiasshift);
protected static final int gammashift = 10; /* gamma = 1024 */
protected static final int gamma = (((int) 1) << gammashift);
protected static final int betashift = 10;
protected static final int beta = (intbias >> betashift); /* beta = 1/1024 */
protected static final int betagamma = (intbias << (gammashift - betashift));
/* defs for decreasing radius factor */
protected static final int initrad = (netsize >> 3); /* for 256 cols, radius starts */
protected static final int radiusbiasshift = 6; /* at 32.0 biased by 6 bits */
protected static final int radiusbias = (((int) 1) << radiusbiasshift);
protected static final int initradius = (initrad * radiusbias); /* and decreases by a */
protected static final int radiusdec = 30; /* factor of 1/30 each cycle */
/* defs for decreasing alpha factor */
protected static final int alphabiasshift = 10; /* alpha starts at 1.0 */
protected static final int initalpha = (((int) 1) << alphabiasshift);
protected int alphadec; /* biased by 10 bits */
/* radbias and alpharadbias used for radpower calculation */
protected static final int radbiasshift = 8;
protected static final int radbias = (((int) 1) << radbiasshift);
protected static final int alpharadbshift = (alphabiasshift + radbiasshift);
protected static final int alpharadbias = (((int) 1) << alpharadbshift);
/*
* Types and Global Variables
* --------------------------
*/
protected byte[] thepicture; /* the input image itself */
protected int lengthcount; /* lengthcount = H*W*3 */
protected int samplefac; /* sampling factor 1..30 */
// typedef int pixel[4]; /* BGRc */
protected int[][] network; /* the network itself - [netsize][4] */
protected int[] netindex = new int[256];
/* for network lookup - really 256 */
protected int[] bias = new int[netsize];
/* bias and freq arrays for learning */
protected int[] freq = new int[netsize];
protected int[] radpower = new int[initrad];
/* radpower for precomputation */
/*
* Initialise network in range (0,0,0) to (255,255,255) and set parameters
* -----------------------------------------------------------------------
*/
public Quant(byte[] thepic, int len, int sample)
{
int i;
int[] p;
thepicture = thepic;
lengthcount = len;
samplefac = sample;
network = new int[netsize][];
for (i = 0; i < netsize; i++)
{
network[i] = new int[4];
p = network[i];
p[0] = p[1] = p[2] = (i << (netbiasshift + 8)) / netsize;
freq[i] = intbias / netsize; /* 1/netsize */
bias[i] = 0;
}
}
public byte[] colorMap()
{
byte[] map = new byte[3 * netsize];
int[] index = new int[netsize];
for (int i = 0; i < netsize; i++)
index[network[i][3]] = i;
int k = 0;
for (int i = 0; i < netsize; i++)
{
int j = index[i];
map[k++] = (byte) (network[j][0]);
map[k++] = (byte) (network[j][1]);
map[k++] = (byte) (network[j][2]);
}
return map;
}
/*
* Insertion sort of network and building of netindex[0..255] (to do after unbias)
* -------------------------------------------------------------------------------
*/
public void inxbuild()
{
int i, j, smallpos, smallval;
int[] p;
int[] q;
int previouscol, startpos;
previouscol = 0;
startpos = 0;
for (i = 0; i < netsize; i++)
{
p = network[i];
smallpos = i;
smallval = p[1]; /* index on g */
/* find smallest in i..netsize-1 */
for (j = i + 1; j < netsize; j++)
{
q = network[j];
if (q[1] < smallval)
{ /* index on g */
smallpos = j;
smallval = q[1]; /* index on g */
}
}
q = network[smallpos];
/* swap p (i) and q (smallpos) entries */
if (i != smallpos)
{
j = q[0];
q[0] = p[0];
p[0] = j;
j = q[1];
q[1] = p[1];
p[1] = j;
j = q[2];
q[2] = p[2];
p[2] = j;
j = q[3];
q[3] = p[3];
p[3] = j;
}
/* smallval entry is now in position i */
if (smallval != previouscol)
{
netindex[previouscol] = (startpos + i) >> 1;
for (j = previouscol + 1; j < smallval; j++)
netindex[j] = i;
previouscol = smallval;
startpos = i;
}
}
netindex[previouscol] = (startpos + maxnetpos) >> 1;
for (j = previouscol + 1; j < 256; j++)
netindex[j] = maxnetpos; /* really 256 */
}
/*
* Main Learning Loop
* ------------------
*/
public void learn()
{
int i, j, b, g, r;
int radius, rad, alpha, step, delta, samplepixels;
byte[] p;
int pix, lim;
if (lengthcount < minpicturebytes)
samplefac = 1;
alphadec = 30 + ((samplefac - 1) / 3);
p = thepicture;
pix = 0;
lim = lengthcount;
samplepixels = lengthcount / (3 * samplefac);
delta = samplepixels / ncycles;
alpha = initalpha;
radius = initradius;
rad = radius >> radiusbiasshift;
if (rad <= 1)
rad = 0;
for (i = 0; i < rad; i++)
radpower[i] = alpha * (((rad * rad - i * i) * radbias) / (rad * rad));
// fprintf(stderr,"beginning 1D learning: initial radius=%d\n", rad);
if (lengthcount < minpicturebytes)
step = 3;
else if ((lengthcount % prime1) != 0)
step = 3 * prime1;
else
{
if ((lengthcount % prime2) != 0)
step = 3 * prime2;
else
{
if ((lengthcount % prime3) != 0)
step = 3 * prime3;
else
step = 3 * prime4;
}
}
i = 0;
while (i < samplepixels)
{
b = (p[pix + 0] & 0xff) << netbiasshift;
g = (p[pix + 1] & 0xff) << netbiasshift;
r = (p[pix + 2] & 0xff) << netbiasshift;
j = contest(b, g, r);
altersingle(alpha, j, b, g, r);
if (rad != 0)
alterneigh(rad, j, b, g, r); /* alter neighbours */
pix += step;
if (pix >= lim)
pix -= lengthcount;
i++;
if (delta == 0)
delta = 1;
if (i % delta == 0)
{
alpha -= alpha / alphadec;
radius -= radius / radiusdec;
rad = radius >> radiusbiasshift;
if (rad <= 1)
rad = 0;
for (j = 0; j < rad; j++)
radpower[j] = alpha * (((rad * rad - j * j) * radbias) / (rad * rad));
}
}
// fprintf(stderr,"finished 1D learning: final alpha=%f !\n",((float)alpha)/initalpha);
}
/*
* Search for BGR values 0..255 (after net is unbiased) and return colour index
* ----------------------------------------------------------------------------
*/
public int map(int b, int g, int r)
{
int i, j, dist, a, bestd;
int[] p;
int best;
bestd = 1000; /* biggest possible dist is 256*3 */
best = -1;
i = netindex[g]; /* index on g */
j = i - 1; /* start at netindex[g] and work outwards */
while ((i < netsize) || (j >= 0))
{
if (i < netsize)
{
p = network[i];
dist = p[1] - g; /* inx key */
if (dist >= bestd)
i = netsize; /* stop iter */
else
{
i++;
if (dist < 0)
dist = -dist;
a = p[0] - b;
if (a < 0)
a = -a;
dist += a;
if (dist < bestd)
{
a = p[2] - r;
if (a < 0)
a = -a;
dist += a;
if (dist < bestd)
{
bestd = dist;
best = p[3];
}
}
}
}
if (j >= 0)
{
p = network[j];
dist = g - p[1]; /* inx key - reverse dif */
if (dist >= bestd)
j = -1; /* stop iter */
else
{
j--;
if (dist < 0)
dist = -dist;
a = p[0] - b;
if (a < 0)
a = -a;
dist += a;
if (dist < bestd)
{
a = p[2] - r;
if (a < 0)
a = -a;
dist += a;
if (dist < bestd)
{
bestd = dist;
best = p[3];
}
}
}
}
}
return (best);
}
public byte[] process()
{
learn();
unbiasnet();
inxbuild();
return colorMap();
}
/*
* Unbias network to give byte values 0..255 and record position i to prepare for sort
* -----------------------------------------------------------------------------------
*/
public void unbiasnet()
{
int i, j;
for (i = 0; i < netsize; i++)
{
network[i][0] >>= netbiasshift;
network[i][1] >>= netbiasshift;
network[i][2] >>= netbiasshift;
network[i][3] = i; /* record colour no */
}
}
/*
* Move adjacent neurons by precomputed alpha*(1-((i-j)^2/[r]^2)) in radpower[|i-j|]
* ---------------------------------------------------------------------------------
*/
protected void alterneigh(int rad, int i, int b, int g, int r)
{
int j, k, lo, hi, a, m;
int[] p;
lo = i - rad;
if (lo < -1)
lo = -1;
hi = i + rad;
if (hi > netsize)
hi = netsize;
j = i + 1;
k = i - 1;
m = 1;
while ((j < hi) || (k > lo))
{
a = radpower[m++];
if (j < hi)
{
p = network[j++];
try
{
p[0] -= (a * (p[0] - b)) / alpharadbias;
p[1] -= (a * (p[1] - g)) / alpharadbias;
p[2] -= (a * (p[2] - r)) / alpharadbias;
}
catch (Exception e)
{
} // prevents 1.3 miscompilation
}
if (k > lo)
{
p = network[k--];
try
{
p[0] -= (a * (p[0] - b)) / alpharadbias;
p[1] -= (a * (p[1] - g)) / alpharadbias;
p[2] -= (a * (p[2] - r)) / alpharadbias;
}
catch (Exception e)
{
}
}
}
}
/*
* Move neuron i towards biased (b,g,r) by factor alpha
* ----------------------------------------------------
*/
protected void altersingle(int alpha, int i, int b, int g, int r)
{
/* alter hit neuron */
int[] n = network[i];
n[0] -= (alpha * (n[0] - b)) / initalpha;
n[1] -= (alpha * (n[1] - g)) / initalpha;
n[2] -= (alpha * (n[2] - r)) / initalpha;
}
/*
* Search for biased BGR values
* ----------------------------
*/
protected int contest(int b, int g, int r)
{
/* finds closest neuron (min dist) and updates freq */
/* finds best neuron (min dist-bias) and returns position */
/* for frequently chosen neurons, freq[i] is high and bias[i] is negative */
/* bias[i] = gamma*((1/netsize)-freq[i]) */
int i, dist, a, biasdist, betafreq;
int bestpos, bestbiaspos, bestd, bestbiasd;
int[] n;
bestd = ~(((int) 1) << 31);
bestbiasd = bestd;
bestpos = -1;
bestbiaspos = bestpos;
for (i = 0; i < netsize; i++)
{
n = network[i];
dist = n[0] - b;
if (dist < 0)
dist = -dist;
a = n[1] - g;
if (a < 0)
a = -a;
dist += a;
a = n[2] - r;
if (a < 0)
a = -a;
dist += a;
if (dist < bestd)
{
bestd = dist;
bestpos = i;
}
biasdist = dist - ((bias[i]) >> (intbiasshift - netbiasshift));
if (biasdist < bestbiasd)
{
bestbiasd = biasdist;
bestbiaspos = i;
}
betafreq = (freq[i] >> betashift);
freq[i] -= betafreq;
bias[i] += (betafreq << gammashift);
}
freq[bestpos] += beta;
bias[bestpos] -= betagamma;
return (bestbiaspos);
}
}来源：CSDN
作者：anttu
链接：https://blog.csdn.net/anttu/article/details/72588265